This however is not the strongest form of security that one could imagine: it is contingent on our current best guess regarding the underlying physics which describes the world.
A more reliable form of security would be independent of a specific physical theory, and instead, be based on primitive physical principles that we may expect to hold regardless of the ultimate theory of nature.
The framework of Generalised Probabilistic Theories (GPTs) provides an operational framework in which we can address such problems.
For example the possibility of key distribution [1]} and impossibility of bit commitment [2]}, [3]} have been demonstrated for a wide range of physical theories.
